For anyone trying to beat the weekly strike I'm a level 24 and my two friends are 23 and we found it pretty difficult but we found a spot in the far left corner after you go through the door. One hides in the crevice and shoots and revives and the other two take cover behind the rock formation and focus pho and any mobs that run up. It takes patience and I'm not sure if the system messed up but we didn't get anything besides the strange coins even though it was a weekly raid.